... 嵌刃钻头 inserted drill 三刃钻头 six point bit; three point bit; three-point bit; three-wing bit 双刃钻头 two point bit ...
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three point bit 三刃钻头
three point bit three-wing bit 三刃钻头
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In order to grade the used bits, IADC published the Three Point Dull bit Grading Scheme.
为了对已使用的钻头进行磨损定级，IADC制定了T - B - G钻头磨损三位定级方法。
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